The AArch64 -fix-cortex-a53-843419 is missing a test case for the load and store exclusive instructions. This was leading to a function not being covered in the codebase. This change adds two new instruction sequences to be recognised as an instance of the erratum, one with a load exclusive the other with a store exclusive.
This will add coverage for:
static bool isV8NonStructureLoad(uint32_t Instr) { if (isLoadExclusive(Instr)) return true;
As well as the test more thoroughly the isLoadStoreExclusive() function. The effect of adding the new tests has the unfortunate side-effect of altering the relative offsets of the branches so I've needed to update the other tests to account for it.