8238960: linux-i586 builds are inconsistent as the newly build jdk is not able to reserve enough space for object heap
Reviewed-by: andrew

Reviewed-by: andrew

Reviewed-by: andrew, ihse, martin

--HG--
extra : rebase_source : 2a25c760fc8d468cccafe00de91fe0d3b9d86c8b
extra : amend_source : 83bcf47ccd45089930e82168efd66c8b03c63fbc

8223219: Backport of JDK-8199552 to OpenJDK 8 leads to duplicate -fstack-protector flags, overriding --with-extra-cflags
Summary: Apply -fstack-protector to all archs and remove duplication in JDK build
Reviewed-by: sgehwolf

Summary: Compile fdlibm with -O3 and relevant C flags on gcc arches.
Reviewed-by: mbaesken, andrew

Reviewed-by: shade

Reviewed-by: jwilhelm

8073139: PPC64: User-visible arch directory and os.arch value on ppc64le cause issues with Java tooling
Reviewed-by: erikj, goetz, dholmes

Summary: Generate debug info for assembler files as needed.
Reviewed-by: erikj

Reviewed-by: erikj

Reviewed-by: erikj

Summary: reapply JDK- 8187045 changes to flags.m4
Reviewed-by: tbell, erikj

Reviewed-by: ihse, kevinw

Reviewed-by: erikj, ihse, ddehaven, billyh

Reviewed-by: erikj, ihse

Reviewed-by: ihse, henryjen, erikj