907dc1e13f
This is not complete support for asm expressions, but allows a few more
test cases from test/behavior/asm.zig to pass. Since the non-register
inputs are named `input_${n}` they can cause name collisions: I'm
wrapping the asm expressions in their own block to prevent that.
Contextually, this change also makes test/behavior/asm.zig run for
stage2, but skips individual tests for most backends (I only verified
the C and LLVM backends successfully run one new test case) and the
entire test file for aarch64, where it's running into preexisting
shortcomings.
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