Sync code from KhronosGroup/glslang.

Fix missing decoration and bug in member remap

control shaders.
Fix bug in member remapping.

Update spirv-tools and spirv-headers known good.

Previous known-good contained regression per sperron at Google.

Update known good SPIRV-Tools commit

Update the known good SPIRV-Tools commit to eventually propagate the
commit allowing the ray tracing stages in pass instrumentation to the
vulkan validation layers (validation layers depends on glslang which
depends on spirv-tools).

ESSL: Fix #1823: Conditions for when derivatives are in compute shader.

Fix #1818: Allow unsized view array dimension for non-block perviewNV attributes

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

OpIsHelperInvocationEXT should declare relevant SPV extension and capability

spirv: Generate missing SampleMaskOverrideCoverageNV capability op

Explicitly remove RTTI in the top-level build config

The SampleMaskOverrideCoverageNV capability should be declared when
gl_SampleMask is used.

Fixes #1831

Add support for SPV_KHR_shader_clock

Avoid generating 8/16-bit constants when 8/16-bit arithmetic extensions aren't enabled

Update spirv tools

Change implementation of gl_SIMDGroupSizeAMD

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

update spirv-headers to pick up demote_to_helper_invocation

Implement GL_EXT_demote_to_helper_invocation