[llvm] AMDGPU: Make v2f64 -> v2f16 conversion Legal only when unsafe fast math is set (PR #134738)

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``````````bash
git-clang-format --diff HEAD~1 HEAD --extensions h,cpp -- llvm/lib/Target/AMDGPU/AMDGPULegalizerInfo.cpp llvm/lib/Target/AMDGPU/AMDGPULegalizerInfo.h llvm/lib/Target/AMDGPU/SIISelLowering.cpp
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View the diff from clang-format here.
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``````````diff
diff --git a/llvm/lib/Target/AMDGPU/AMDGPULegalizerInfo.cpp b/llvm/lib/Target/AMDGPU/AMDGPULegalizerInfo.cpp
index ee3f5dd4e..bf46aef0c 100644
--- a/llvm/lib/Target/AMDGPU/AMDGPULegalizerInfo.cpp
+++ b/llvm/lib/Target/AMDGPU/AMDGPULegalizerInfo.cpp
@@ -1055,7 +1055,7 @@ AMDGPULegalizerInfo::AMDGPULegalizerInfo(const GCNSubtarget &ST_,
   auto &FPTruncActions = getActionDefinitionsBuilder(G_FPTRUNC);
   if (ST.hasCvtPkF16F32Inst()) {
     FPTruncActions.legalFor({{S32, S64}, {S16, S32}, {V2S16, V2S32}})
-                  .customFor({V2S16, V2S64});
+        .customFor({V2S16, V2S64});
   } else
     FPTruncActions.legalFor({{S32, S64}, {S16, S32}});
   FPTruncActions.scalarize(0).lower();
@@ -2750,8 +2750,8 @@ bool AMDGPULegalizerInfo::legalizeFPTrunc(LegalizerHelper &Helper,
   // still used here to be consistent, especially when the fast math flag is
   // not working for FP_ROUND on the SelectDAG path at this moment.
   MachineFunction &MF = Helper.MIRBuilder.getMF();
-  bool AllowInaccurateFPTRUNC = MI.getFlag(MachineInstr::FmAfn) ||
-                                MF.getTarget().Options.UnsafeFPMath;
+  bool AllowInaccurateFPTRUNC =
+      MI.getFlag(MachineInstr::FmAfn) || MF.getTarget().Options.UnsafeFPMath;
 
   if (AllowInaccurateFPTRUNC) {
     // Use the tablegen pattern to select native instructions.

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https://github.com/llvm/llvm-project/pull/134738