[WIP] MSVC FPO debug information

[Jeff Muizelaar]

Here’s a work in progress patch that adds support for FPO tables used for unwinding by x86-32 MSVC.

The basic approach is to add a FPO_INSTRUCTION during X86FrameLowering along with some information in MachineModuleInfo. WinCodeViewLineTables then looks for this instruction and pulls out the relevant information and emits the FPO tables.

Does this seem like a sane approach?

Also, I’m using a generic instruction instead of an X86 one. Does this make sense because WinCodeViewLineTables can’t include the X86 Target headers?

Thanks,

-Jeff

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