[X86] Clean up test/CodeGen/X86/2006-03-01-InstrSchedBug.ll
[X86] Clean up test/CodeGen/X86/2006-03-01-InstrSchedBug.ll

Summary:
- Migrated from grep to FileCheck.
- Re-indented, removed boilerplate comments.
- Added 'entry' label at beginning of basic block.

Patch by Jorge Gorbe!

Reviewed By: RKSimon

Subscribers: RKSimon, jgorbe, llvm-commits

Differential Revision: https://reviews.llvm.org/D30317

git-svn-id: 0ff597fd157e6f4fc38580e8d64ab130330d2411@298298 91177308-0d34-0410-b5e6-96231b3b80d8

GPUOpen-Drivers/llvm,llvm-mirror/llvm,llvm-mirror/llvm,llvm-mirror/llvm,llvm-mirror/llvm,llvm-mirror/llvm,apple/swift-llvm,llvm-mirror/llvm,apple/swift-llvm,GPUOpen-Drivers/llvm,GPUOpen-Drivers/llvm,llvm-mirror/llvm,GPUOpen-Drivers/llvm,GPUOpen-Drivers/llvm,llvm-mirror/llvm,llvm-mirror/llvm,GPUOpen-Drivers/llvm,apple/swift-llvm,apple/swift-llvm,apple/swift-llvm,apple/swift-llvm,GPUOpen-Drivers/llvm,GPUOpen-Drivers/llvm,apple/swift-llvm,apple/swift-llvm