Fix crash on coopmat conversion without decoration (#3190)

The SPIR-V reader would crash on the added test during reverse
translation. Ensure any cooperative matrix type conversion is handled
the same way as a cooperative matrix type conversion with an
FPRoundingMode or SaturatedConversion decoration.

Original commit:
KhronosGroup/SPIRV-LLVM-Translator@32738f937103712

Author: svenvh

llvm-spirv/lib/SPIRV/SPIRVReader.cpp

@@ -2984,7 +2984,8 @@ Value *SPIRVToLLVM::transValueWithoutDecoration(SPIRVValue *BV, Function *F,
     if (isCvtOpCode(OC) && OC != OpGenericCastToPtrExplicit) {
       auto *BI = static_cast<SPIRVInstruction *>(BV);
       Value *Inst = nullptr;
-      if (BI->hasFPRoundingMode() || BI->isSaturatedConversion())
+      if (BI->hasFPRoundingMode() || BI->isSaturatedConversion() ||
+          BI->getType()->isTypeCooperativeMatrixKHR())
         Inst = transSPIRVBuiltinFromInst(BI, BB);
       else
         Inst = transConvertInst(BV, F, BB);

llvm-spirv/test/extensions/KHR/SPV_KHR_cooperative_matrix/conversion_instructions.ll

@@ -44,6 +44,19 @@ entry:
   ret void
 }
 
+; CHECK-SPIRV: CompositeConstruct [[#MatrixTypeFloat]] [[#MatrixIn:]] [[#]] {{$}}
+; CHECK-SPIRV: ConvertFToU [[#MatrixTypeInt32]] [[#]] [[#MatrixIn]]
+
+; CHECK-LLVM: %[[#Matrix:]] = call spir_func target("spirv.CooperativeMatrixKHR", float, 3, 12, 12, 2) @_Z26__spirv_CompositeConstructf(float 0.000000e+00)
+; CHECK-LLVM: call spir_func target("spirv.CooperativeMatrixKHR", i32, 3, 12, 12, 2) @_Z73__spirv_ConvertFToU_RPU3AS144__spirv_CooperativeMatrixKHR__uint_3_12_12_2PU3AS145__spirv_CooperativeMatrixKHR__float_3_12_12_2(target("spirv.CooperativeMatrixKHR", float, 3, 12, 12, 2) %[[#Matrix]])
+
+define void @convert_f_to_u_no_fproundingmode() {
+entry:
+  %0 = tail call spir_func noundef target("spirv.CooperativeMatrixKHR", float, 3, 12, 12, 2) @_Z26__spirv_CompositeConstructFloat(float 0.000000e+00)
+  %call = call spir_func target("spirv.CooperativeMatrixKHR", i32, 3, 12, 12, 2) @_Z73__spirv_ConvertFToU_RPU3AS144__spirv_CooperativeMatrixKHR__uint_3_12_12_2PU3AS145__spirv_CooperativeMatrixKHR__float_3_12_12_2(target("spirv.CooperativeMatrixKHR", float, 3, 12, 12, 2) %0)
+  ret void
+}
+
 ; CHECK-SPIRV: CompositeConstruct [[#MatrixTypeFloat]] [[#MatrixIn:]] [[#]] {{$}}
 ; CHECK-SPIRV: ConvertFToS [[#MatrixTypeInt32]] [[#]] [[#MatrixIn]]
 
@@ -132,6 +145,8 @@ declare spir_func noundef target("spirv.CooperativeMatrixKHR", i16, 3, 12, 12, 2
 
 declare spir_func noundef target("spirv.CooperativeMatrixKHR", i8, 3, 12, 12, 2) @_Z26__spirv_CompositeConstructInt8(i8 noundef)
 
+declare spir_func noundef target("spirv.CooperativeMatrixKHR", i32, 3, 12, 12, 2) @_Z73__spirv_ConvertFToU_RPU3AS144__spirv_CooperativeMatrixKHR__uint_3_12_12_2PU3AS145__spirv_CooperativeMatrixKHR__float_3_12_12_2(target("spirv.CooperativeMatrixKHR", float, 3, 12, 12, 2) noundef)
+
 declare spir_func noundef target("spirv.CooperativeMatrixKHR", i32, 3, 12, 12, 2) @_Z77__spirv_ConvertFToU_RPU3AS144__spirv_CooperativeMatrixKHR__uint_3_12_12_2_rtpPU3AS145__spirv_CooperativeMatrixKHR__float_3_12_12_2(target("spirv.CooperativeMatrixKHR", float, 3, 12, 12, 2) noundef)
 
 declare spir_func noundef target("spirv.CooperativeMatrixKHR", i32, 3, 12, 12, 2) @_Z77__spirv_ConvertFToS_RPU3AS144__spirv_CooperativeMatrixKHR__uint_3_12_12_2_rtpPU3AS145__spirv_CooperativeMatrixKHR__float_3_12_12_2(target("spirv.CooperativeMatrixKHR", float, 3, 12, 12, 2) noundef)