[Sema] Enable -Wimplicit-float-conversion for integral to floating point precision...

[Sema] Enable -Wimplicit-float-conversion for integral to floating point precision loss

Issue an warning when the code tries to do an implicit int -> float
conversion, where the float type ha a narrower significant than the
float type.

The new warning is controlled by flag -Wimplicit-int-float-conversion,
under -Wimplicit-float-conversion and -Wconversion. It is also silenced
when c++11 narrowing warning is issued.

Differential Revision: https://reviews.llvm.org/D64666

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@367497 91177308-0d34-0410-b5e6-96231b3b80d8