[sancov][LoongArch] Resolve pcaddu18i+jirl in evaluateBranch and teach sancov (#155371)

This commit overrides `updateState` and `resetState` hooks in
`MCInstrAnalysis` in order to be able to analyze pcaddu18i+jirl pairs
inside `evaluateBranch`.

After this commit, `llvm-objdump` is able to correctly analyze and print
detailed information. `lld/test/ELF/loongarch-call36.s` shows the
changes.

Besides, this commit also teaches sancov to resolve such call sequences.
Without this commit, some tests in compiler-rt failed:

```
Failed Tests :
  SanitizerCommon-asan-loongarch64-Linux :: sanitizer_coverage_trace_pc_guard-dso.cpp
  SanitizerCommon-asan-loongarch64-Linux :: sanitizer_coverage_trace_pc_guard.cpp
  SanitizerCommon-lsan-loongarch64-Linux :: sanitizer_coverage_trace_pc_guard-dso.cpp
  SanitizerCommon-lsan-loongarch64-Linux :: sanitizer_coverage_trace_pc_guard.cpp
  SanitizerCommon-msan-loongarch64-Linux :: sanitizer_coverage_trace_pc_guard-dso.cpp
  SanitizerCommon-msan-loongarch64-Linux :: sanitizer_coverage_trace_pc_guard.cpp
```

The reason is that sancov could not resolve pcaddu18i+jirl call sequence
correctly and caused mismatches between coverage points in the binary
and the .sancov file:

```
ERROR: Coverage points in binary and .sancov file do not match.
```

NOTE: A similar issue might also occur on RISC-V when relaxation is
disabled (not verified). This commit can also fix for it.

0 files changed, 0 insertions, 0 deletions