Quickly - several things jump out:
a) IntADC1Handler, // ADC Sequence 0 Suspect your MCU has 2 ADC modules (ADC0 & ADC1) - everywhere else you use ADC0 - ADC1 usage as you show here seems unwise
b) IntEnable(ADC_INT_SS0); might IntEnable(INT_ADC0SS0); prove superior?
c) not thrilled w/your calling order: here is what works - our group: (safest to first disable - then config!)
ROM_IntDisable(INT_ADC0SS0); // note we use ROM calls - yours will work as well
ROM_ADCIntDisable(ADC0_BASE, 0);
ROM_ADCSequenceDisable(ADC0_BASE, 0);
and then SeqConfig, SeqStepConfig, SeqEnable, ADCIntClear, ADCIntEnable, IntEnable
d) while not (yet) yielding an error - PWMOutputState shows 2 entries - yet you've PinTyped & PinConfig'ed just PB6. Neighbor PB7 serves ready/able to provide that missing link...
Do not know - nor like the singular vendor focus of CCS - so cannot advise in that regard... Guidance here should get you closer - if not, "all the way."