[llvm] [SPIRV] Change how to detect OpenCL/Vulkan Env and update tests accordingly. (PR #129689)

[Nathan Gauër via llvm-commits]

================
@@ -767,10 +767,10 @@ Register SPIRVGlobalRegistry::buildGlobalVariable(
   // TODO: maybe move to GenerateDecorations pass.
   const SPIRVSubtarget &ST =
       cast<SPIRVSubtarget>(MIRBuilder.getMF().getSubtarget());
-  if (IsConst && ST.isOpenCLEnv())
+  if (IsConst && !ST.isShaderEnv())
     buildOpDecorate(Reg, MIRBuilder, SPIRV::Decoration::Constant, {});
 
-  if (GVar && GVar->getAlign().valueOrOne().value() != 1 && !ST.isVulkanEnv()) {
+  if (GVar && GVar->getAlign().valueOrOne().value() != 1 && !ST.isShaderEnv()) {
----------------
Keenuts wrote:

```suggestion
  if (GVar && GVar->getAlign().valueOrOne().value() != 1 && ST.isKernelEnv()) {
```

https://github.com/llvm/llvm-project/pull/129689