This reverts commit 8a849a2a567d4e519b246a16936b6e7519936d4b.
It seems I missed a spot when trying to ensure the code in the
instruction selection tests were actually legalized MIR.
This adds `-disable-gisel-legality-check` to some gfx6 and gfx7 test
lines to prevent behavior mismatches between debug and release builds
The first attempted reapply was #111059
This reverts commit e075dcf7d270fd52dc837163ff24e8c872dfeb49.
This reverts commit 650c41aad2eb43c634a05b2b5799a0c13a73b92f.
The test failures appear to be from conflicts with other PRs that landed around this time.
Certain pointer address spaces were not being correctly handled by the
GlobalISel lowering for buffer_load and buffer_store.
1. ptr addrspace(1) and addrspace(4) did not have rewrite patterns
defined for them, while p0 did, since those pointer types weren't in the
list of types that was iterated to form the patterns.
2. Vectors of pointers need to be bitcast to vectors of the
corresponding scalars, since there doesn't seem to be a good way to
define the rewrite patterns for buffer_load/store of those types
The need to bitcast vectors of pointers was also revealed to affect
ordinary `G_LOAD` and `G_STORE` in some cases, so
`shouldBitcastLoadStore()` has been fixed to handle it properly.
