SPV: Fix #1783: Don't do bounds checking for spec-const-expression size

It's okay for symbolic spec-consts, but without constant folding,
not okay when the array size is an expression.

gtests/Spv.FromFile.cpp

@@ -545,6 +545,7 @@ INSTANTIATE_TEST_CASE_P(
         "vulkan.vert",
         "vulkan.comp",
         "samplerlessTextureFunctions.frag",
+        "spv.specConstArrayCheck.vert",
     })),
     FileNameAsCustomTestSuffix
 );