[Offload][test] Use just-compiled lld and llvm-symbolizer (#181793) In a bootstrapping build with LLVM_ENABLE_PROJECTS=lld, the lld executable will be found in LLVM's bin/ directory. But `check-offload` will currently ignore it because the JIT plugin will look for `lld` in `$PATH`. Similarly, the sanitizer tests require llvm-symbolizer during execution to FileCheck the expected stack trace. Add the llvm tools directory to `$PATH` so tests can use lld and llvm-symbolizer in it. It should be prefered over a system-installed lld/llvm-symbolizer. Fixes the JIT and sanitizer tests of [openmp-offload-amdgpu-clang-flang](https://lab.llvm.org/staging/#/builders/105).
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