[test] Fix new CodeGenPrepare test for non-X86 systems

[thejh]

Summary

The new test llvm/test/Transforms/CodeGenPrepare/remove-assume-block.ll
breaks on non-X86 machines. Change it to look like the existing test
llvm/test/Transforms/CodeGenPrepare/X86/delete-assume-dead-code.ll
to fix it.

[thejh]

Is there a way to force a specific builder (like https://lab.llvm.org/buildbot/#/builders/107) to test a change like this? Or does the change have to be committed before those builders can run on it?

[bkramer]

In D97952#2603633, @thejh wrote:

Is there a way to force a specific builder (like https://lab.llvm.org/buildbot/#/builders/107) to test a change like this? Or does the change have to be committed before those builders can run on it?

Yeah, those builders can't run pre-commit. And the few pre-commit bots we have don't have the non-x86 config.

llvm/test/Transforms/CodeGenPrepare/X86/remove-assume-block.ll

-; RUN: opt -S -codegenprepare < %s | FileCheck %s
+; RUN: opt -S -codegenprepare -mtriple=x86_64-linux < %s | FileCheck %s
 ;
 ; Ensure that blocks that only contain @llvm.assume are removed completely
 ; during CodeGenPrepare.
 
-target triple = "x86_64-unknown-linux-gnu"
-
 ; CHECK-LABEL: @simple(
 ; CHECK-NEXT: end:
 ; CHECK-NEXT: ret void
 define void @simple(i64 %addr, i1 %assumption) {
   %cmp1 = icmp eq i64 %addr, 0
   br i1 %cmp1, label %do_assume, label %end
 
 do_assume: