[PATCH 0/2] testsuite: Support filtering targets by TCL procedure in `run_dump_test'

[Maciej W. Rozycki]

Hi,

 Inspired by GCC's `dg-require-effective-target' and prompted by Simon's 
recently submitted test case that fails on MIPS non-shared-library targets 
(currently `mipsel-ps2-elf' and `mips64el-ps2-elf') here's a proposed 
implementation of a test tag interpretation update, which lets one name a 
TCL procedure to call in a .d file interpreted by `run_dump_test' with 
tags so far only used to refer to target triplets.

 This removes the need to wrap `run_dump_test' calls into an `if' block 
whose only reason is to do a feature check, keeps the check within the 
test case itself where tool options related to the check might be also 
present making it all localised rather than scattered across files, and 
ultimately lets one have the test reported as UNSUPPORTED automagically if 
required (not currently supported by the LD version of `run_dump_test').

 This mini patch series has the implementation across all the three of 
binutils, GAS and LD test suites in 1/2 and a MIPS LD test suite update 
with `[check_shared_lib_support]' added where appropriate in 2/2.  See 
individual changes for detailed descriptions.

  Maciej