8382392: Mixed jstack does not work on Alpine

[YaSuenag]

After JDK-8377946, we can see test failure on ClhsdbPstack.java. But the failure was happened before JDK-8377946 - test is passed, but we can see the exception and the function symbol was not been resolved. (You can see .jtr files in JBS)

DwarfParser should scan .eh_frame first. but .debug_frame should be scanned as fallback if target PC was not found in .eh_frame.

According to System V ABI for AMD64, frame information should be included in .eh_frame (See 6.3 Unwinding Through Assembler Code)

In musl C, I found out the discussion for .eh_frame vs .debug_frame: https://www.openwall.com/lists/musl/2021/07/17/13
musl C does not seem to want to support .eh_frame - they seem to want to use .debug_frame for stack unwinding in debugging. But it could be different from ABI spec in above.

This PR is not small, but commit history might help to review.

• Use lib->base directly - remove unnecessary field from eh_frame_info.
• Move debuginfo related code to salibelf from symtab - as a preparation for .debug_frame, debuginfo related code is needed for this PR, but it is written in symtab.c. So moved it to another file (salibelf.c).
• Rename "eh_frame_info" to "frame_info" - frame information in SA is no longer for .eh_frame, so renamed.
• Use .debug_frame if DWARF parser could not find PC from .eh_frame - implement DWARF parser for .debug_frame.
• Validate sender SP before to return sender frame in LinuxAMD64CFrame.java -
  current LinuxAMD64CFrame might enter infinity loop not to find out bottom frame (I saw this case on Alpine), thus add condition for frame validation with stack pointer.
• Re-enable mixed jstack tests on musl C - as stated in the commit message.
• Update copyright year - as stated in the commit message.

Note that all of mixed jstack tests have been disabled on Alpine (musl C) since JDK-8382327. They are re-enabled in this PR.

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Issue

• JDK-8382392: Mixed jstack does not work on Alpine (Bug - P4)

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