[WGSL] Add missing constant functions

https://bugs.webkit.org/show_bug.cgi?id=263554
rdar://117371037

Reviewed by Mike Wyrzykowski.

Finish implementing constant functions for (nearly) all type declarations. This
just leaves functions that operate on matrices and functions that return structs
(e.g. modf), which are both currently unsupported.

* Source/WebGPU/WGSL/ConstantFunctions.h:
(WGSL::constantUnaryOperation):
(WGSL::constantBinaryOperation):
(WGSL::constantTernaryOperation):
(WGSL::constantConstructor):
(WGSL::constantVector):
(WGSL::constantMatrix):
(WGSL::constantAdd):
(WGSL::constantMinus):
(WGSL::constantMultiply):
(WGSL::BINARY_OPERATION):
(WGSL::UNARY_OPERATION):
(WGSL::constantBitwiseOr):
(WGSL::constantBitwiseAnd):
(WGSL::constantVec2):
(WGSL::constantVec3):
(WGSL::constantVec4):
(WGSL::constantAll):
(WGSL::constantAny):
(WGSL::constantSelect):
(WGSL::TERNARY_OPERATION):
(WGSL::constantCross):
(WGSL::constantDeterminant):
(WGSL::constantDistance):
(WGSL::constantDot):
(WGSL::constantLength):
(WGSL::constantFaceForward):
(WGSL::constantFma):
(WGSL::constantFract):
(WGSL::constantFrexp):
(WGSL::constantInsertBits):
(WGSL::constantInverseSqrt):
(WGSL::constantLdexp):
(WGSL::constantModf):
(WGSL::constantNormalize):
(WGSL::constantQuantizeToF16):
(WGSL::constantReflect):
(WGSL::constantRefract):
(WGSL::constantTranspose):
(WGSL::constantPow): Deleted.
(WGSL::constantDivide): Deleted.
(WGSL::constantEqual): Deleted.
(WGSL::constantNotEqual): Deleted.
(WGSL::constantLt): Deleted.
(WGSL::constantLtEq): Deleted.
(WGSL::constantGt): Deleted.
(WGSL::constantGtEq): Deleted.
(WGSL::constantNot): Deleted.
(WGSL::constantOr): Deleted.
(WGSL::constantAnd): Deleted.
(WGSL::constantBitwiseNot): Deleted.
(WGSL::constantBitwiseXor): Deleted.
(WGSL::constantBitwiseShiftLeft): Deleted.
(WGSL::constantBitwiseShiftRight): Deleted.
(WGSL::constantBool): Deleted.
(WGSL::constantI32): Deleted.
(WGSL::constantU32): Deleted.
(WGSL::constantF32): Deleted.
* Source/WebGPU/WGSL/ConstantValue.h:
(WGSL::ConstantValue::isVector const):
(WGSL::ConstantValue::toVector const):
* Source/WebGPU/WGSL/TypeDeclarations.rb:
* Source/WebGPU/WGSL/generator/main.rb:

Canonical link: https://commits.webkit.org/269721@main