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* Add and fix the emulation of several instruction. * Disable frame pointer usage on Android. * Specify return address register for the unwind plan instead of explict tracking the value of RA. * Replace prologue detection heuristics (unreliable in several cases) with a logic to follow the branch instructions and restore the CFI value based on them. The target address for a branch should have the same CFI as the source address (if they are in the same function). * Handle symbols in ELF files where the symbol size is not specified with calcualting their size based on the next symbol (already done in MachO files). * Fix architecture in FuncUnwinders with filling up the inforamtion missing from the object file with the architecture of the target. * Add code to read register wehn the value is set to "IsSame" as it meanse the value of a register in the parent frame is the same as the value in the current frame. Differential revision: http://reviews.llvm.org/D10447 llvm-svn: 240533