Erik Desjardins c4d69b717f make noalias-box-off filecheck more precise
The CHECK, -NOT, -SAME pattern ensures that the `CHECK-NOT: noalias`
is limited to only one line, and won't match unrelated lines further
down in the file.

Explicit drop call added to preserve the `foo` argument name, since
names of unused arguments are not preserved.
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..
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The files here use the LLVM FileCheck framework, documented at https://llvm.org/docs/CommandGuide/FileCheck.html.

One extension worth noting is the use of revisions as custom prefixes for FileCheck. If your codegen test has different behavior based on the chosen target or different compiler flags that you want to exercise, you can use a revisions annotation, like so:

// revisions: aaa bbb
// [bbb] compile-flags: --flags-for-bbb

After specifying those variations, you can write different expected, or explicitly unexpected output by using <prefix>-SAME: and <prefix>-NOT:, like so:

// CHECK: expected code
// aaa-SAME: emitted-only-for-aaa
// aaa-NOT:                        emitted-only-for-bbb
// bbb-NOT:  emitted-only-for-aaa
// bbb-SAME:                       emitted-only-for-bbb