Update of the release notes: '-z' is also forwarded to the linker

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Also describe the new check 'alpha.core.TestAfterDivZero'

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Merging r215229:
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r215229 | sylvestre | 2014-08-08 10:15:13 -0700 (Fri, 08 Aug 2014) | 11 lines

Fix a bug when scan-build is used in a cross-compilation environment with
the --use-cc option.

Instead, we will search in the PATH
For example:
 scan-build --use-cc=arm-none-eabi-gcc -o out make -e

Initially reported as a Debian Bug:
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=748777


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Document the new warning -Wabsolute-value

git-svn-id: https://llvm.org/svn/llvm-project/cfe/branches/release_35@215525 91177308-0d34-0410-b5e6-96231b3b80d8
Document -Wtautological-pointer-compare & -Wtautological-undefined-compare with example

git-svn-id: https://llvm.org/svn/llvm-project/cfe/branches/release_35@215651 91177308-0d34-0410-b5e6-96231b3b80d8
Document -Wabsolute-value with example

git-svn-id: https://llvm.org/svn/llvm-project/cfe/branches/release_35@215652 91177308-0d34-0410-b5e6-96231b3b80d8