RFR: 8254790: javax/xml/crypto/dsig/GenerationTests.java failed with SIGSEGV in C2 frame

[Sandhya Viswanathan]

The problem was due to 32 bit arithmetic instruction used for 64-bit address in
string_indexof_char and stringL_indexof_char: "addl(result, ch)".

This patch replaces the addl instruction with addptr and also enables the stringL_indexof_char intrinsic.

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Commit messages:
 - 8254790: javax/xml/crypto/dsig/GenerationTests.java failed with SIGSEGV in C2 frame

Changes: https://git.openjdk.java.net/jdk/pull/772/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=772&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8254790
  Stats: 3 lines in 2 files changed: 0 ins; 0 del; 3 mod
  Patch: https://git.openjdk.java.net/jdk/pull/772.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/772/head:pull/772

PR: https://git.openjdk.java.net/jdk/pull/772