Previously compilation of a few tests produced incorrect code. In them FP
pragmas were ignored and the resulting code contained constrained intrinsics
with rounding mode and/or exception behavior determined by command line
options only. Compiler creates correct AST for this tests, but FP options
were ignored in code generator because builder object was not set up properly.
To fix code generation builder object now is updated according to FP options
stored in CompoundStmt.