NVStore call crashes when compiled with ARMCC

[romkuz01]

Use the following main.cpp to reproduce the crash:

#include "nvstore.h"

const uint8_t global_buffer[91] = {0}; // doesn't crash without "const"

int main()
{
     NVStore &nvstore = NVStore::get_instance();

     printf("Trying to reproduce NVStore crash...\n");
     nvstore.set(10, sizeof(global_buffer), global_buffer);
     printf("NVStore didn't crash...\n");
}

Compile and run with:
mbed compile -t ARM -m K64F --profile debug -f

The failure was detected with ARMCC version:
ARM Compiler 5.06 update 3 (build 300)

Some observations:

• Crashes only with --profile set to "debug" or "release", doesn't crash with "develop"
• Passes when "const" removed from array definition
• Passes if array is defined as uint32_t (change in data alignment?)

[0xc0170]

@davidsaada Please review

[davidsaada]

Resolved by PR #6864.

[ciarmcom]

ARM Internal Ref: MBOTRIAGE-68