pull-tcg-20210107

Richard Henderson

@rth7680

e5e2e4c7 · tcg: Constify TCGLabelQemuLdst.raddr · Jan 07, 2021

Build fix for ppc64 centos7.
Reduce the use of scratch registers for tcg/i386.
Use _aligned_malloc for Win32.
Enable split w^x code gen buffers.