[clang] Set FP options in Sema when instantiating CompoundStmt

When an expression is instantiated, TreeTransform skips ImplicitCastExpr
nodes, assuming they are recreated when the instantiated expression is
built. It breaks functions that use non-default floating-point options,
because they are kept in these ImplicitCastExprs. In this case the
recreated ImplicitCastExpr takes FP options from the current Sema state
and not from AST node.

To fix this issue the FP options in Sema object are set when a compound
statement is cloned in TreeTransform.

This change fixes https://github.com/llvm/llvm-project/issues/64605
([Regression 16 -> 17] Template instantiation ignores FENV_ACCESS being
ON for both definition and instantiation).

Differential Revision: https://reviews.llvm.org/D158158