[lld] [llvm] [LTO] Override TargetABI from module flags if present when creating T… (PR #126497)

[Alex Bradbury via llvm-commits]

asb wrote:

@kito-cheng I'd mentioned in the last RISC-V sync-up call that I was seeing warnings when linking e.g. SPEC in the llvm-test-suite and Sam mentioned this patch. I was wondering to what degree there are known issues you're tracking (and if there is a bug report for this?). Trialling this patch, I actually see _more_ warnings emitted when linking spec 2017. (Obviously, that doesn't necessarily indicate a problem with the patch - we could just be surfacing more underlying issues). Is this expected?

Before:

```
[4955/4968] Linking CXX executable External/SPEC/CFP2017rate/511.povray_r/511.povray_r
Hard-float 'd' ABI can't be used for a target that doesn't support the D instruction set extension (ignoring target-abi)
[4956/4968] Linking CXX executable External/SPEC/CINT2017speed/620.omnetpp_s/620.omnetpp_s
Hard-float 'd' ABI can't be used for a target that doesn't support the D instruction set extension (ignoring target-abi)
[4957/4968] Linking CXX executable External/SPEC/CINT2017rate/520.omnetpp_r/520.omnetpp_r
Hard-float 'd' ABI can't be used for a target that doesn't support the D instruction set extension (ignoring target-abi)
[4962/4968] Linking C executable External/SPEC/CINT2017speed/600.perlbench_s/600.perlbench_s
Hard-float 'd' ABI can't be used for a target that doesn't support the D instruction set extension (ignoring target-abi)
[4963/4968] Linking C executable External/SPEC/CINT2017rate/500.perlbench_r/500.perlbench_r
Hard-float 'd' ABI can't be used for a target that doesn't support the D instruction set extension (ignoring target-abi)
[4964/4968] Linking CXX executable External/SPEC/CINT2017rate/523.xalancbmk_r/523.xalancbmk_r
Hard-float 'd' ABI can't be used for a target that doesn't support the D instruction set extension (ignoring target-abi)
[4965/4968] Linking CXX executable External/SPEC/CINT2017speed/623.xalancbmk_s/623.xalancbmk_s
Hard-float 'd' ABI can't be used for a target that doesn't support the D instruction set extension (ignoring target-abi)
[4968/4968] Linking CXX executable External/SPEC/CFP2017rate/526.blender_r/526.blender_r
Hard-float 'd' ABI can't be used for a target that doesn't support the D instruction set extension (ignoring target-abi)
```

After:
```
[4909/4968] Linking CXX executable tools/not
Hard-float 'd' ABI can't be used for a target that doesn't support the D instruction set extension (ignoring target-abi)
[4938/4968] Linking CXX executable External/SPEC/CINT2017rate/541.leela_r/541.leela_r
Hard-float 'd' ABI can't be used for a target that doesn't support the D instruction set extension (ignoring target-abi)
[4939/4968] Linking CXX executable External/SPEC/CINT2017speed/641.leela_s/641.leela_s
Hard-float 'd' ABI can't be used for a target that doesn't support the D instruction set extension (ignoring target-abi)
[4952/4968] Linking CXX executable External/SPEC/CFP2017rate/508.namd_r/508.namd_r
Hard-float 'd' ABI can't be used for a target that doesn't support the D instruction set extension (ignoring target-abi)
[4955/4968] Linking CXX executable External/SPEC/CINT2017rate/520.omnetpp_r/520.omnetpp_r
Hard-float 'd' ABI can't be used for a target that doesn't support the D instruction set extension (ignoring target-abi)
Hard-float 'd' ABI can't be used for a target that doesn't support the D instruction set extension (ignoring target-abi)
[4956/4968] Linking CXX executable External/SPEC/CFP2017rate/511.povray_r/511.povray_r
Hard-float 'd' ABI can't be used for a target that doesn't support the D instruction set extension (ignoring target-abi)
[4957/4968] Linking CXX executable External/SPEC/CINT2017speed/620.omnetpp_s/620.omnetpp_s
Hard-float 'd' ABI can't be used for a target that doesn't support the D instruction set extension (ignoring target-abi)
Hard-float 'd' ABI can't be used for a target that doesn't support the D instruction set extension (ignoring target-abi)
[4961/4968] Linking CXX executable External/SPEC/CFP2017rate/510.parest_r/510.parest_r
Hard-float 'd' ABI can't be used for a target that doesn't support the D instruction set extension (ignoring target-abi)
[4962/4968] Linking C executable External/SPEC/CINT2017rate/500.perlbench_r/500.perlbench_r
Hard-float 'd' ABI can't be used for a target that doesn't support the D instruction set extension (ignoring target-abi)
[4963/4968] Linking C executable External/SPEC/CINT2017speed/600.perlbench_s/600.perlbench_s
Hard-float 'd' ABI can't be used for a target that doesn't support the D instruction set extension (ignoring target-abi)
[4964/4968] Linking CXX executable External/SPEC/CINT2017speed/623.xalancbmk_s/623.xalancbmk_s
Hard-float 'd' ABI can't be used for a target that doesn't support the D instruction set extension (ignoring target-abi)
Hard-float 'd' ABI can't be used for a target that doesn't support the D instruction set extension (ignoring target-abi)
[4965/4968] Linking CXX executable External/SPEC/CINT2017rate/523.xalancbmk_r/523.xalancbmk_r
Hard-float 'd' ABI can't be used for a target that doesn't support the D instruction set extension (ignoring target-abi)
Hard-float 'd' ABI can't be used for a target that doesn't support the D instruction set extension (ignoring target-abi)
[4967/4968] Linking C executable External/SPEC/CINT2017rate/502.gcc_r/502.gcc_r
[4968/4968] Linking CXX executable External/SPEC/CFP2017rate/526.blender_r/526.blender_r
Hard-float 'd' ABI can't be used for a target that doesn't support the D instruction set extension (ignoring target-abi)
Hard-float 'd' ABI can't be used for a target that doesn't support the D instruction set extension (ignoring target-abi)
```


https://github.com/llvm/llvm-project/pull/126497