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[AST][FPEnv] Keep FP options in trailing storage of CastExpr

Authored by sepavloff on Sep 12 2020, 7:54 AM.

Description

[AST][FPEnv] Keep FP options in trailing storage of CastExpr

This is recommit of 6c8041aa0f, reverted in de044f7562 because of some
fails. Original commit message is below.

This change allow a CastExpr to have optional FPOptionsOverride object,
stored in trailing storage. Of all cast nodes only ImplicitCastExpr,
CStyleCastExpr, CXXFunctionalCastExpr and CXXStaticCastExpr are allowed
to have FPOptions.

Differential Revision: https://reviews.llvm.org/D85960

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