This pass fixups the opcode used for OpExtInst instructions
to use OpExtInstWithForwardRefsKHR when it contains a forward
reference.
This pass is agnostic to the extension used, hence the validity
of the code depends of the validity of the usage:
If a forward reference is used on a non-semantic extended instruction,
the generated code will remain invalid, but the opcode will change.
What this pass guarantees is valid code won't become invalid.
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Signed-off-by: Nathan Gauër <brioche@google.com>
Co-authored-by: Steven Perron <stevenperron@google.com>
