[X86] Rename O3-pipeline.ll to opt-pipeline.ll and add O1/O2 command lines.

[craig.topper]

Summary

Eric Cristopher asked me about possibly disabling some passes at
-O1/Og. Figured a good first step was to test all the pipelines.
They all appear to be the same for now. Hoping we can use FileCheck
prefixes for differences to avoid repeating the contents 3 times.

[RKSimon]

LGTM

[lebedev.ri]

I do not understand why we can't just have llvm/test/CodeGen/X86/O{0,1,2,3}-pipeline.ll, like there already is for plain opt?

[craig.topper]

In D82423#2111112, @lebedev.ri wrote:

I do not understand why we can't just have llvm/test/CodeGen/X86/O{0,1,2,3}-pipeline.ll, like there already is for plain opt?

I was just trying to make it so updating the pipeline didn’t require editing 3 files. We also have changes to this test in our downstream code base so I was trying to make it just work when we synced this change.

[RKSimon]

This was committed at rG1a4f8889800a8c80819602725c5ce509ded2d451

llvm/test/CodeGen/X86/opt-pipeline.ll

 ; When EXPENSIVE_CHECKS are enabled, the machine verifier appears between each
 ; pass. Ignore it with 'grep -v'.
+; RUN: llc -mtriple=x86_64-- -O1 -debug-pass=Structure < %s -o /dev/null 2>&1 \
+; RUN:   | grep -v 'Verify generated machine code' | FileCheck %s
+; RUN: llc -mtriple=x86_64-- -O2 -debug-pass=Structure < %s -o /dev/null 2>&1 \
+; RUN:   | grep -v 'Verify generated machine code' | FileCheck %s
 ; RUN: llc -mtriple=x86_64-- -O3 -debug-pass=Structure < %s -o /dev/null 2>&1 \
 ; RUN:   | grep -v 'Verify generated machine code' | FileCheck %s
 
 ; REQUIRES: asserts
 
 ; CHECK-LABEL: Pass Arguments:
 ; CHECK-NEXT: Target Library Information
 ; CHECK-NEXT: Target Pass Configuration