[llvm] WebAssembly: Move runtime libcall setting out of TargetLowering (PR #142624)

[Thomas Lively via llvm-commits]

================
@@ -277,5 +277,10 @@ void RuntimeLibcallsInfo::initLibcalls(const Triple &TT) {
       setLibcallName(RTLIB::MULO_I64, nullptr);
     }
     setLibcallName(RTLIB::MULO_I128, nullptr);
+  } else {
----------------
tlively wrote:

This particular change LGTM, but @nikic, can you explain where the `!TT.isWasm` above came from? It looks like you added it in dad9e4a.

https://github.com/llvm/llvm-project/pull/142624