JDK-8287001 introduced a warning on hsdis library load failure. This is useful when the user executes -XX:+PrintAssembly, etc.

However, I think that when hs_err occurs, users might be confused by this warning printed by Xlog. Because users are not likely to know that hsdis is loaded for the [MachCode] section of the hs_err report, they may wonder, for example, "Why do I get warnings about hsdis load errors when -XX:+PrintAssembly is not specified?."
Also, if, for example, the user does not specify the option to specify where the hs_err report should be output(ErrorFileToStdout or ErrorFileToStderr), the warning is printed in stdout by default, but the [MachCode] section is printed in the hs_err_pid log file. This makes it difficult for user to understand the relationship between warning and the [MachCode] section.

To clear up this confusion, I suggest printing a warning just before [MachCode]:
e.g.
If hs_err occurs and hsdis load fails without the option to specify where the hs_err report should be output, the following is output to the hs_err_pir log file:
```
.
.
native method entry point (kind = native) [0x000001ae8753cec0, 0x000001ae8753dac0] 3072 bytes

Loading hsdis library failed, so undisassembled code is printed in the below [MachCode] section
[MachCode]
  0x000001ae8753cec0: 488b 4b08 | 0fb7 492e | 584c 8d74 | ccf8 6800 | 0000 0068 | 0000 0000 | 5055 488b | ec41 5548
  0x000001ae8753cee0: 8b43 084c | 8d68 3848 | 8b40 0868 | 0000 0000 | 5348 8b50 | 18
.
.
```

If -XX:+PrintAssembly is specified and hsdis load fails, the following is output to the stdout
```
$ java -XX:+UnlockDiagnosticVMOptions -XX:+PrintAssembly -version
OpenJDK 64-Bit Server VM warning: PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output

============================= C1-compiled nmethod ==============================
----------------------------------- Assembly -----------------------------------

Compiled method (c1) 57 2 3 java.lang.Object::<init> (1 bytes)
 total in heap [0x0000024a08a00008,0x0000024a08a00208] = 512
.
.

[Constant Pool (empty)]


Loading hsdis library failed, so undisassembled code is printed in the below [MachCode] section
[MachCode]
[Instructions begin]
  0x0000024a08a00100: 6666 660f | 1f84 0000 | 0000 0066 | 6666 9066 | 6690 448b | 5208 443b
.
.
[Constant Pool (empty)]


Loading hsdis library failed, so undisassembled code is printed in the below [MachCode] section
[MachCode]
[Verified Entry Point]
  # {method} {0x00000000251a1898} 'toUnsignedInt' '(B)I' in 'java/lang/Byte
.
.
```

Since the warning added in this fix cover the role of warning introduced in JDK-8287001 , I think that the lines added in JDK-8287001 and JDK-8289421 can be removed.