[SPIRV] `FPRoundingMode` decoration misuse detected by `spirv-val`
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backend:SPIR-V
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- LLVM
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Description
An update on `spirv-val` (likely https://github.com/KhronosGroup/SPIRV-Tools/pull/6537) started revealing issues on the SPIRV backend.
```
Failed Tests (3):
LLVM :: CodeGen/SPIRV/llvm-intrinsics/constrained-arithmetic.ll
LLVM :: CodeGen/SPIRV/llvm-intrinsics/constrained-fmuladd.ll
LLVM :: CodeGen/SPIRV/transcoding/OpenCL/convert_functions.ll
```
```
# | error: line 47: FPRoundingMode decoration can be applied only to a conversion instruction to or from a floating-point type.
# | %19 = OpFAdd %float %a %a
```
```
# | error: line 60: FPRoundingMode decoration can be applied only to a conversion instruction to or from a floating-point type.
# | %25 = OpUConvert %uchar %24
```
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