Changes

Fix some errors in <arm_neon.h> tests that cause them to fail with lax
vector conversions disabled.
llvm-svn: 374457

[GISel] Allow getConstantVRegVal() to return G_FCONSTANT values.
In GISel we have both G_CONSTANT and G_FCONSTANT, but because in GISel
we don't really have a concept of Float vs Int value the only difference
between the two is where the data originates from.
What both G_CONSTANT and G_FCONSTANT return is just a bag of bits with
the constant representation in it.
By making getConstantVRegVal() return G_FCONSTANTs bit representation as
well we allow ConstantFold and other things to operate with G_FCONSTANT.
Adding tests that show ConstantFolding to work on mixed G_CONSTANT and
G_FCONSTANT sources.
Differential Revision: https://reviews.llvm.org/D68739
llvm-svn: 374458