Remove support for x86 32 bits #572
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This enables some simplifications in target-independent files.
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The 32-bit x86 port of CompCert is no longer useful, now that all x86 processors made in the last 15 years are 64-bit processors and all x86 OS are 64-bit by default and increasingly stop supporting 32-bit applications. There are a few legacy embedded systems built around 32-bit x86 processors, but they lack SSE2 support, which CompCert requires to implement FP arithmetic.
At the same time, 32-bit x86 support required unnatural changes in CompCert, to accommodate peculiarities of the x86-32 ABI: FP function results returned on the FP stack, reduced alignment for
doubleandlong long, etc. Removing this code will make CompCert easier to support in the future.