[PATCH 4/6] Testsuite: Make it easier to debug environment setting functions

[Tamar Christina]

Hi All,

This adds verbose output to dg-set-compiler-env-var and dg-set-target-env-var
so you can actually see what they're setting when you add -v -v.

Bootstrapped Regtested on aarch64-none-linux-gnu and no issues.

Ok for master?

Thanks,
Tamar

gcc/testsuite/ChangeLog:

	* lib/gcc-dg.exp (dg-set-compiler-env-var, dg-set-target-env-var): Add
	verbose output.

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