Security update for gcc7

This update for gcc7 fixes the following issues:

- CVE-2020-13844: Added mitigation for aarch64 Straight Line Speculation issue (bsc#1172798)
- Enable fortran for the nvptx offload compiler.
- Update README.First-for.SuSE.packagers
- avoid assembler errors with AVX512 gather and scatter instructions when using -masm=intel.
- Backport the aarch64 -moutline-atomics feature and accumulated fixes but not its
default enabling. [jsc#SLE-12209, bsc#1167939]
- Fixed 32bit libgnat.so link. [bsc#1178675]
- Fixed memcpy miscompilation on aarch64. [bsc#1178624, bsc#1178577]
- Fixed debug line info for try/catch. [bsc#1178614]
- Remove -mbranch-protection=standard (aarch64 flag) when gcc7 is used to build gcc7 (ie when ada is enabled)
- Fixed corruption of pass private ->aux via DF. [gcc#94148]
- Fixed debug information issue with inlined functions and passed by reference arguments. [gcc#93888]
- Fixed binutils release date detection issue.
- Fixed register allocation issue with exception handling code on s390x. [bsc#1161913]
- Fixed miscompilation of some atomic code on aarch64. [bsc#1150164]

This update was imported from the SUSE:SLE-15:Update update project.

Fixed bugs
bnc#1178675
[Staging] brp-check-suse bug fix exposes packaging bug in gcc/gcc7/gcc10
bnc#1167939
Use LSE instructions in glibc's mutex_lock
bnc#1178624
On AArch64 memcpy expansion cannot handle length > 32-bit signed int max
bnc#1178577
Please backport fixes for gcc PR97535
bnc#1161913
SLES 12 SP3 - SLES GCC generates wrong code for exception handling
bnc#1172798
VUL-0: CVE-2020-13844: gcc, llvm: ARMv8 straight-line speculation
bnc#1178614
Incorrect line info for try/catch
bnc#1150164
CLOCK_MONOTONIC and CLOCK_REALTIME appear to be broken on thunderX1
Selected Binaries
cpp7 cpp7-debuginfo gcc7 gcc7-32bit gcc7-ada gcc7-ada-32bit gcc7-ada-debuginfo gcc7-c++ gcc7-c++-32bit gcc7-c++-debuginfo gcc7-debuginfo gcc7-debugsource gcc7-fortran gcc7-fortran-32bit gcc7-fortran-debuginfo gcc7-go gcc7-go-32bit gcc7-go-debuginfo gcc7-info gcc7-locale gcc7-objc gcc7-obj-c++ gcc7-obj-c++-32bit gcc7-objc-32bit gcc7-obj-c++-debuginfo gcc7-objc-debuginfo libada7 libada7-32bit libada7-32bit-debuginfo libada7-debuginfo libasan4 libasan4-32bit libasan4-32bit-debuginfo libasan4-debuginfo libcilkrts5 libcilkrts5-32bit libcilkrts5-32bit-debuginfo libcilkrts5-debuginfo libgfortran4 libgfortran4-32bit libgfortran4-32bit-debuginfo libgfortran4-debuginfo libgo11 libgo11-32bit libgo11-32bit-debuginfo libgo11-debuginfo libobjc4 libobjc4-32bit libobjc4-32bit-debuginfo libobjc4-debuginfo libubsan0 libubsan0-32bit libubsan0-32bit-debuginfo libubsan0-debuginfo libstdc++6-devel-gcc7 libstdc++6-devel-gcc7-32bit
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