[Test][Driver] Clean up FileCheck prefixes for internal shell

[ramonasuncion]

Partially address: #84407

[ramonasuncion]

@swift-ci please smoke test

[hnrklssn]

The _LAX versions were added in this commit:

commit d4ffaa375991c771412856b809b74bc157bd63bd
Author: Jordan Rose <jordan_rose@apple.com>
Date:   Thu Jun 9 20:19:55 2016 -0700

    [test] Check LD_LIBRARY_PATH a little less strictly.

    LD_LIBRARY_PATH is one of the few environment variables the LLVM 'lit'
    tool /doesn't/ strip out, presumably because on some Linux systems
    it's necessary to run some of the built products being tested.
    However, the Swift driver also uses LD_LIBRARY_PATH when providing -L
    options to the script interpreter on Linux. Weaken some of our tests
    when there's an LD_LIBRARY_PATH in the environment.

    (There are similar environment variables on OS X, but we don't have to
    do anything special there because lit /does/ strip those out. This is
    presumably okay because all of LLVM's load-time dependencies on OS X
    are in standard system locations.)

    https://bugs.swift.org/browse/SR-813

It's never necessary to check both the LINUX prefixes and the LINUX_LAX prefixes, because if the LINUX checks pass, the LINUX_LAX checks will also pass. There are cases where LINUX_LAX passes but LINUX does not, however.

I would propose either keeping only the LINUX_LAX versions, because it's clearly not that important to assert that there is nothing else in the LD_LIBRARY_PATH. The other option would be to explicitly unset LD_LIBRARY_PATH for each test using env -u LD_LIBRARY_PATH and skip the LINUX_LAX option. That might break on some Linux platforms though (I'm not entirely sure).

[ramonasuncion]

@swift-ci please smoke test

[hnrklssn]

Timed Out Tests (1):
  lldb-shell :: Breakpoint/jit-loader_rtdyld_elf.test

[hnrklssn]

@swift-ci please smoke test windows platform

[ramonasuncion]

The test failed again, even though it's unsupported... 😕

UNSUPPORTED: Swift(windows-x86_64) :: Driver/options-interpreter.swift (2138 of 12143)

[hnrklssn]

Test Suite 'CompilationDatabaseTests' started at 2025-11-08 04:20:13.069

Test Case 'CompilationDatabaseTests.testJSONCompilationDatabaseCoding' started at 2025-11-08 04:20:13.069

C:\Users\swift-ci\jenkins\workspace\swift-PR-windows\sourcekit-lsp\Tests\BuildServerIntegrationTests\CompilationDatabaseTests.swift:148: error: CompilationDatabaseTests.testJSONCompilationDatabaseCoding : XCTAssertEqual failed: ("JSONCompilationDatabase(pathToCommands: [b -- file:///C:/a/: [0], b -- file:///C:/c/: [1]], commands: [BuildServerIntegration.CompilationDatabaseCompileCommand(directory: "a", filename: "b", commandLine: [], output: nil), BuildServerIntegration.CompilationDatabaseCompileCommand(directory: "c", filename: "b", commandLine: [], output: nil)], compileCommandsDirectory: file:///C:/)") is not equal to ("JSONCompilationDatabase(pathToCommands: [b -- file:///C:/a/: [0], b -- file:///C:/Users/swift-ci/jenkins/workspace/swift-PR-windows/sourcekit-lsp/: [1]], commands: [BuildServerIntegration.CompilationDatabaseCompileCommand(directory: "a", filename: "b", commandLine: [], output: nil), BuildServerIntegration.CompilationDatabaseCompileCommand(directory: "c", filename: "b", commandLine: [], output: nil)], compileCommandsDirectory: file:///C:/)") - 

Test Case 'CompilationDatabaseTests.testJSONCompilationDatabaseCoding' failed (0.013 seconds)

Test Suite 'CompilationDatabaseTests' failed at 2025-11-08 04:20:13.082

	 Executed 1 test, with 1 failure (0 unexpected) in 0.013 (0.013) seconds

Test Suite 'Selected tests' failed at 2025-11-08 04:20:13.082

	 Executed 1 test, with 1 failure (0 unexpected) in 0.013 (0.013) seconds

Pretty sure it's unrelated. Not sure if it's broken on main, or just flaky. Sometimes you gotta give it a couple of attempts.

[hnrklssn]

@swift-ci please smoke test windows platform