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TM4C123GH6PM: Tiva ROM Library memory no longer available

Part Number: TM4C123GH6PM

I am debugging code that uses both the C Tiva Peripheral library and the MAP_xxx library calls.

My first call is 

SysCtlClockSet(SYSCTL_SYSDIV_4 | SYSCTL_USE_PLL | SYSCTL_OSC_MAIN | SYSCTL_XTAL_16MHZ);

After this call is

s_ui32SysClock = MAP_SysCtlClockGet();

Debugging in assembly

LDR.N   R0, PC, #0x94

R0:001000044

LDR R0, [R0]

R0:0xCDCDCDCD

When I look at memory 0x01000000 I see nothing but 0xCD bytes for all of memory.

Where has the ROM based Tiva peripheral library gone?

I have been working with this processor for months and never encountered this problem.

I am using the IAR IDE.

The version of Tiva peripheral library is 2.1.2.111