Re: Fold more boolean expressions

["MCC CS" <mcccs@gmx.com>]

Hi, I have bootstrapped and make check'd my final patch
on latest trunk. Is it OK? Could you please push it
if possible?

The patch can be found here, but please update the commit
message date:
https://gcc.gnu.org/ml/gcc-patches/2018-09/msg00803.html

Test result:

Native configuration is x86_64-pc-linux-gnu

		=== gcc tests ===


Running target unix

		=== gcc Summary ===

# of expected passes		134514
# of expected failures		462
# of unsupported tests		2109
/home/usr/Desktop/gcc-build/gcc/xgcc  version 9.0.0 20180916 (experimental) (GCC) 

		=== g++ tests ===


Running target unix
FAIL: g++.dg/pr80481.C  -std=gnu++98  scan-assembler-not vmovaps
FAIL: g++.dg/pr80481.C  -std=gnu++11  scan-assembler-not vmovaps
FAIL: g++.dg/pr80481.C  -std=gnu++14  scan-assembler-not vmovaps
FAIL: g++.dg/pr83239.C  -std=gnu++98 (test for excess errors)

		=== g++ Summary ===

# of expected passes		127011
# of unexpected failures	4
# of expected failures		532
# of unsupported tests		5028
/home/usr/Desktop/gcc-build/gcc/xg++  version 9.0.0 20180916 (experimental) (GCC) 

		=== libatomic tests ===


Running target unix

		=== libatomic Summary ===

# of expected passes		54
		=== libgomp tests ===


Running target unix

		=== libgomp Summary ===

# of expected passes		2031
# of expected failures		1
# of unsupported tests		188
		=== libitm tests ===


Running target unix

		=== libitm Summary ===

# of expected passes		42
# of expected failures		3
# of unsupported tests		1
		=== libstdc++ tests ===


Running target unix

		=== libstdc++ Summary ===

# of expected passes		12667
# of expected failures		77
# of unsupported tests		589

Compiler version: 9.0.020180916(experimental)(GCC) 
Platform: x86_64-pc-linux-gnu
configure flags: --enable-languages=c,c++ --prefix=/home/usr/Desktop/gcc-out --with-system-zlib --enable-checking=release --disable-multilib --with-abi=m64