Work around SPIRV validation failure.

It may be relying on initializing InstrInfo with the under-initialized
subtarget.

Author: arsenm

llvm/lib/Target/SPIRV/SPIRVSubtarget.cpp

@@ -49,13 +49,15 @@ static bool isAtLeastVer(VersionTuple Target, VersionTuple VerToCompareTo) {
   return Target.empty() || Target >= VerToCompareTo;
 }
 
+// FIXME: initSubtargetDependencies should be called on the InstrInfo
+// initializer, not the following FrameLowering
 SPIRVSubtarget::SPIRVSubtarget(const Triple &TT, const std::string &CPU,
                                const std::string &FS,
                                const SPIRVTargetMachine &TM)
     : SPIRVGenSubtargetInfo(TT, CPU, /*TuneCPU=*/CPU, FS),
-      PointerSize(TM.getPointerSizeInBits(/* AS= */ 0)),
-      InstrInfo(initSubtargetDependencies(CPU, FS)), FrameLowering(*this),
-      TLInfo(TM, *this), TargetTriple(TT) {
+      PointerSize(TM.getPointerSizeInBits(/* AS= */ 0)), InstrInfo(*this),
+      FrameLowering(initSubtargetDependencies(CPU, FS)), TLInfo(TM, *this),
+      TargetTriple(TT) {
   switch (TT.getSubArch()) {
   case Triple::SPIRVSubArch_v10:
     SPIRVVersion = VersionTuple(1, 0);