[Bug binutils/28602] binutils/testsuite/lib/binutils-common.exp: Support free-form shell commands and check patterns

[i at maskray dot me]

https://sourceware.org/bugzilla/show_bug.cgi?id=28602

--- Comment #1 from Fangrui Song <i at maskray dot me> ---
>From https://maskray.me/blog/2021-08-08-toolchain-testing#split-file

In Aug 2020, I added `split-file` to llvm-project which allows you to place
multiple extra files in one file. It'd be nice if binutils has something
similar.

Use case A (organizing input of different formats (e.g. linker
script+assembly) in one file).

```text
# RUN: split-file %s %t
# RUN: llvm-mc %t/asm -o %t.o
# RUN: ld.lld -T %t/lds %t.o -o %t
This is sometimes better than the %S/Inputs/ approach because the user
can see the auxiliary files immediately and don't have to open another file.

# asm
...
# lds
...
```

Use case B (for utilities which don't have built-in input splitting feature):

```text
// RUN: split-file %s %t
// RUN: llc < %t/1.ll | FileCheck %s --check-prefix=CASE1
// RUN: llc < %t/2.ll | FileCheck %s --check-prefix=CASE2
Combing tests prudently can improve readability.
For example, when testing parsing errors if the recovery mechanism isn't
possible,
grouping the tests in one file can more readily see test coverage/strategy.

//--- 1.ll
...
//--- 2.ll
...
```

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