[Sanitizer] Remove empty method

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@199481 91177308-0d34-0410-b5e6-96231b3b80d8
[asan] Link runtime library with -lm -Wl,-z,defs to ensure that it declares all its dependencies.


git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@199483 91177308-0d34-0410-b5e6-96231b3b80d8
[asan] extend asan-coverage (still experimental).
 - add a mode for collecting per-block coverage (-asan-coverage=2).
   So far the implementation is naive (all blocks are instrumented),
   the performance overhead on top of asan could be as high as 30%.
 - Make sure the one-time calls to __sanitizer_cov are moved to function buttom,
   which in turn required to copy the original debug info into the call insn.

Here is the performance data on SPEC 2006
(train data, comparing asan with asan-coverage={0,1,2}):

                             asan+cov0     asan+cov1      diff 0-1    asan+cov2       diff 0-2      diff 1-2
       400.perlbench,        65.60,        65.80,         1.00,        76.20,         1.16,         1.16
           401.bzip2,        65.10,        65.50,         1.01,        75.90,         1.17,         1.16
             403.gcc,         1.64,         1.69,         1.03,         2.04,         1.24,         1.21
             429.mcf,        21.90,        22.60,         1.03,        23.20,         1.06,         1.03
           445.gobmk,       166.00,       169.00,         1.02,       205.00,         1.23,         1.21
           456.hmmer,        88.30,        87.90,         1.00,        91.00,         1.03,         1.04
           458.sjeng,       210.00,       222.00,         1.06,       258.00,         1.23,         1.16
      462.libquantum,         1.73,         1.75,         1.01,         2.11,         1.22,         1.21
         464.h264ref,       147.00,       152.00,         1.03,       160.00,         1.09,         1.05
         471.omnetpp,       115.00,       116.00,         1.01,       140.00,         1.22,         1.21
           473.astar,       133.00,       131.00,         0.98,       142.00,         1.07,         1.08
       483.xalancbmk,       118.00,       120.00,         1.02,       154.00,         1.31,         1.28
            433.milc,        19.80,        20.00,         1.01,        20.10,         1.02,         1.01
            444.namd,        16.20,        16.20,         1.00,        17.60,         1.09,         1.09
          447.dealII,        41.80,        42.20,         1.01,        43.50,         1.04,         1.03
          450.soplex,         7.51,         7.82,         1.04,         8.25,         1.10,         1.05
          453.povray,        14.00,        14.40,         1.03,        15.80,         1.13,         1.10
             470.lbm,        33.30,        34.10,         1.02,        34.10,         1.02,         1.00
         482.sphinx3,        12.40,        12.30,         0.99,        13.00,         1.05,         1.06


git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@199488 91177308-0d34-0410-b5e6-96231b3b80d8
Support NetBSD/ARM.


git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@199492 91177308-0d34-0410-b5e6-96231b3b80d8
[asan] use correct type when computing shadow address in allocator (caused SEGV when asan run-time is built with gcc 4.8.2 on 32-bit arch)

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@199544 91177308-0d34-0410-b5e6-96231b3b80d8
Fix think-o from r199332 -- write to the new_filename we're building, not
filename the global variable.


git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@199572 91177308-0d34-0410-b5e6-96231b3b80d8
[msandr] Access app TLS directly in native exec mode.

In optimized hybrid execution we do not use DynamoRIO private loader, which
mangles TLS access, so we can access the application's TLS directly.

Patch by Qin Zhao.


git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@199655 91177308-0d34-0410-b5e6-96231b3b80d8
merge upstream master