[llvm] [ARM] Disable strict node mutation and use correct lowering for several strict ops (PR #170136)

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``````````bash
git-clang-format --diff origin/main HEAD --extensions cpp -- llvm/lib/Target/ARM/ARMISelLowering.cpp --diff_from_common_commit
``````````

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``````````diff
diff --git a/llvm/lib/Target/ARM/ARMISelLowering.cpp b/llvm/lib/Target/ARM/ARMISelLowering.cpp
index 1a8c47060..3b6f98c46 100644
--- a/llvm/lib/Target/ARM/ARMISelLowering.cpp
+++ b/llvm/lib/Target/ARM/ARMISelLowering.cpp
@@ -872,7 +872,7 @@ ARMTargetLowering::ARMTargetLowering(const TargetMachine &TM_,
     setOperationAction(ISD::FP_TO_UINT, MVT::i32, Custom);
     setOperationAction(ISD::FP_TO_SINT, MVT::f64, Custom);
     setOperationAction(ISD::FP_TO_UINT, MVT::f64, Custom);
-    setOperationAction(ISD::FP_ROUND,   MVT::f32, Custom);
+    setOperationAction(ISD::FP_ROUND, MVT::f32, Custom);
     setOperationAction(ISD::STRICT_FP_TO_SINT, MVT::f64, Custom);
     setOperationAction(ISD::STRICT_FP_TO_UINT, MVT::f64, Custom);
     setOperationAction(ISD::STRICT_FP_ROUND,   MVT::f32, Custom);
@@ -1262,14 +1262,13 @@ ARMTargetLowering::ARMTargetLowering(const TargetMachine &TM_,
   setOperationAction(ISD::FSINCOS, MVT::f32, Expand);
 
   // FP-ARMv8 implements a lot of rounding-like FP operations.
-  if (Subtarget->hasFPARMv8Base()) {    
+  if (Subtarget->hasFPARMv8Base()) {
     for (auto Op :
-         {ISD::FFLOOR,            ISD::FCEIL,             ISD::FROUND,
-          ISD::FTRUNC,            ISD::FNEARBYINT,        ISD::FRINT,
-          ISD::FROUNDEVEN,        ISD::FMINNUM,           ISD::FMAXNUM,
-          ISD::STRICT_FFLOOR,     ISD::STRICT_FCEIL,      ISD::STRICT_FROUND,
-          ISD::STRICT_FTRUNC,     ISD::STRICT_FNEARBYINT, ISD::STRICT_FRINT,
-          ISD::STRICT_FROUNDEVEN, ISD::STRICT_FMINNUM,    ISD::STRICT_FMAXNUM}) {
+         {ISD::FFLOOR, ISD::FCEIL, ISD::FROUND, ISD::FTRUNC, ISD::FNEARBYINT,
+          ISD::FRINT, ISD::FROUNDEVEN, ISD::FMINNUM, ISD::FMAXNUM,
+          ISD::STRICT_FFLOOR, ISD::STRICT_FCEIL, ISD::STRICT_FROUND,
+          ISD::STRICT_FTRUNC, ISD::STRICT_FNEARBYINT, ISD::STRICT_FRINT,
+          ISD::STRICT_FROUNDEVEN, ISD::STRICT_FMINNUM, ISD::STRICT_FMAXNUM}) {
       setOperationAction(Op, MVT::f32, Legal);
 
       if (Subtarget->hasFP64())

``````````

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https://github.com/llvm/llvm-project/pull/170136